Tilapia prefer water with a dissolved oxygen concentra-
tion of at least 3 ppm so that the oxygen will diffuse
from the water (higher concentration) into the fish
(lower concentration). Imagine you are an AgWorks in-
tern, and you test the dissolved oxygen level of the
tilapia tank. You read a result of 1 ppm.
Answer the following questions that describe why this
test result is a concern for the tilapia.
1. Explain if the level of dissolved oxygen level of 1 ppm
is too high or too low
2. In what direction will the oxygen will travel across the
cell membranes of the fish - from the water into the
fish-or- from the fish into the water
3. What is the type of cellular transport that is taking place
if the oxygen travels across the cell membranes from
high concentration to low concentration - simple
diffusion, active transport or osmosis
